Apex domains cannot have CNAME records.
Question and response
Question
dig mcra.fr. NS
Answer
mcra.fr. 5 NS ns1.mcra.fr.
mcra.fr. 5 NS ns0.mcra.fr.
Authority
The response has no authority records.
Additional
ns0.mcra.fr. 5 A 62.210.80.154
ns1.mcra.fr. 5 A 62.210.80.131
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0